Scattered light (top) and emitted light (bottom), noise error σ (Eq. (40)) with viewing angle α and wavelength (colour bar). The nominal noise error values for N_inc/atm = 10⁵ (dash-dot line), 10⁶ (dashed line), 10⁷ (solid line) and 10⁸ (dotted line) are the horizontal black lines. Most scattered and emitted light images are near or below the nominal values, suggesting that each packet contributes once or more to multiple images.